Uni-Loc Bullet Pin & Insert. The Bullets design provides flexibility for manufacturing and allows it to pivot inside the insert and still stay straight. Bullet Joints are available in small quantities to custom cue makers only and are not interchangeable with other Uni-Loc joints. One-turn-on, one turn off joint system. Stainless Steel pin with a Brass insert. Not interchangeable with The Original. Sleek design.